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A Jenkins pipeline fails with this error: 'No agent specified'. What is the likely cause?

medium📝 Troubleshoot Q7 of 15
Spring Boot - Docker and Deployment
A Jenkins pipeline fails with this error: 'No agent specified'. What is the likely cause?
AThe echo command is misspelled
BThe stages block is empty
CThe pipeline syntax uses tabs instead of spaces
DThe pipeline block is missing an agent declaration
Step-by-Step Solution
Solution:

  1. Step 1: Understand 'No agent specified' error

    This error means Jenkins does not know where to run the pipeline steps because agent is missing.

  2. Step 2: Check pipeline structure

    Agent must be declared at pipeline or stage level; missing it causes this error.

  3. Final Answer:

    The pipeline block is missing an agent declaration -> Option D

  4. Quick Check:

    Agent declaration required in pipeline [OK]
Quick Trick: Always declare agent in Jenkins pipeline [OK]
Common Mistakes:
  • Ignoring agent declaration
  • Assuming empty stages cause this error
  • Blaming indentation for agent error

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